[committed] libffi: Support go closures on 32-bit hppa

[John David Anglin]

The attached change adds libffi go closure support on 32-bit hppa.  It also has some cleanups.
We now use CFI directives for unwind support on linux.

Go is a work in progress.

Tested on hppa2.0w-hp-hpux11.11 and hppa-unknown-linux-gnu.  Committed to gcc trunk.

Dave
--
John David Anglin	dave.anglin@bell.net


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